condition mean min max ZT0-3 10.642800000000001 10.642800000000001 10.642800000000001 ZT4-7 8.030435 8.030435 8.030435 ZT8-11 9.273254999999999 9.273254999999999 9.273254999999999 ZT12-15 9.69753 9.69753 9.69753 ZT16-19 11.86975 11.86975 11.86975 ZT20-23 10.9472 10.9472 10.9472